CVE-2025-21593 Information

Description

An Improper Control of a Resource Through its Lifetime vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated network-based attacker to cause a Denial-of-Service (DoS).

On devices with SRv6 (Segment Routing over IPv6) enabled an attacker can send a malformed BGP UPDATE packet which will cause the rpd to crash and restart. Continued receipt of these UPDATE packets will cause a sustained DoS condition. 

This issue affects iBGP and eBGP and both IPv4 and IPv6 are affected by this vulnerability.This issue affects Junos OS: 

All versions before 21.2R3-S9 
from 21.4 before 21.4R3-S10 
from 22.2 before 22.2R3-S5 
from 22.3 before 22.3R3-S4 
from 22.4 before 22.4R3-S3 
from 23.2 before 23.2R2-S2 
from 23.4 before 23.4R2;

and Junos OS Evolved: 

All versions before 21.2R3-S9-EVO 
from 21.4-EVO before 21.4R3-S10-EVO 
from 22.2-EVO before 22.2R3-S5-EVO 
from 22.3-EVO before 22.3R3-S4-EVO 
from 22.4-EVO before 22.4R3-S3-EVO
from 23.2-EVO before 23.2R2-S2-EVO 
from 23.4-EVO before 23.4R2-EVO.

CVSS Vector

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Reference

https://supportportal.juniper.net/JSA92861

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

NONE

Base Score

HIGH

Base Severity

6.5